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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af84753cbe0ac74ac7f8dfb901f50f2c53ff61bbcbdb325a149d53255afd146b' 
  AND token = 'RJfE7cDie6wl18Uootr+6V1XdSxJpJP6pShGvEc3EME=' 
  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"
    }
  }
}