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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a02b08d2ddbf96dca133b38e66878ec67d145194a1c25fab8dd2e47a8952897' 
  AND token = 'adI4gDmbqTR5YaxkYCE3dSX0OB7ShAIVwd4bUmuQcps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}