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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af5d830406fce470f1dc1d261bae3dc0e29ff4f8e56a3961074bb34e4c617aeb' 
  AND token = 'Mhsqf7m3bldu9x2mh55shLEHKRlfpv3fX0or8dGnAMk=' 
  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"
    }
  }
}