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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a98be8d145a650566fae0a006651e4beddb576ea44ce02516e70bcc0d5e1f6' 
  AND token = 'MGeuY67Ngwc4+eLRch0DIKcUrDiFOwHBjnLlVkqamb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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