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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c70bdd693e47fc5327f2af57e00c1a0f1b1d1cbc8eade3134d3c3734927078b6' 
  AND token = 'ydL9ghEIEAzejfVWSSMMW6ksiWU3ofA2g8IFD09ers4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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