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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f20dbc4fd2c5df79813562082e0baa34b54230fca3070db02cac8b50809f8f8' 
  AND token = '5/uphIoqS/SLUNfsaiZ7kL/f18Tu1ksh+Bb88Nlh7w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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