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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceefe8f07b1b058f5041401c4a670136cd6fc2e98ac3ad493c6d2f62d2caf597' 
  AND token = 'JW79UfKtFBBYzspK2BpFWuu6DfHq0Qj3Jam/d45cL2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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