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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b699520de24775ef801f329bcf957bb09b77e2d303ba4985bc1df829aa9929b8' 
  AND token = 'FEdWR3bteI/7tSnLSr4DYzz2/mE714sMH8OTdDumbHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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