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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2a869c2c3094c9fa318453f7d8fd557397ef34d0fb311034bb5406f1113d28a' 
  AND token = 'bHUe6yYUbhD53ehcr3RGuDfj3MjJOPlIdSElaATuaFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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