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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efdd5875bde0825ac1a1a43c643c41aa5ea8faf0ec35cd7e3b769070a9de5a45' 
  AND token = 'X5HDsEA8tpjaGTGj2exQTi7n42/kvC2r65Xx89L3Bcs=' 
  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"
    }
  }
}