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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca79bac4163f6af6cd171e377dc3a414a7ee6078e5af789e6c34509bfd1d047a' 
  AND token = 'AVfJG+y/v3LdD/qaMXnnpm/zMNAUDHzTXhHVZvK40+Q=' 
  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"
    }
  }
}