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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d07e6007c7c4c2470f71a7e47ae9a0484314b0463836e7e53dbb00e539357e' 
  AND token = 'il+hCIue+6HMsJwoTafDixealpZXoa15FCNeiAFDTPg=' 
  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"
    }
  }
}