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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1eaa0d3582530ef9e7eb7e9fae12fdd643c9c599bbded54d7ee726b8607edac' 
  AND token = 'pX3eIRdZ73550iV7/F1TiMxZtr+u2qk3r9q2K9x9nZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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