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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2c8be0d58c0bc6be6ff5f01f12b4ce13cfa81b02b1a6f1e0531318c8fb6b1b8' 
  AND token = '4MlSCNCfmx+jvBdCTW3E6DKr86KJRPzVG2azAaW69Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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