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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198250f56540b4cb359df0e2759ec96b04f28a395daed949c0746a0e70133255' 
  AND token = 'iFxYC3fdjh3tMxNdui1202LFiIs21jSI5yWgZA4+z+0=' 
  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"
    }
  }
}