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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0ec1f7761b8a550f7505986bd997371b169e14f8723150387781cb226747c10' 
  AND token = 'cpoesnP3GEeo9E6fA+mCmYhwsK/xiD8Zdwyd3NJuZv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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