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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54edcfb2978e77c92bcd9069199fb56419099c210881768d03b2754fd709e8d1' 
  AND token = 'Ty0Es+22cf/TkaNYRxwWZl22xc3wCFSdb2JRcZlq4BY=' 
  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"
    }
  }
}