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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e63c9b812da00af49c7404dcb5c4bd3b624b0df175dbe648d43aa6ac7655bbb3' 
  AND token = 'HZ37FORpS0yLJ/4WRgejgMu5ODisj7VtxvGEOH+9Yis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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