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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb09fd307ca1dcfb37507bf90298ecf4fca99971e97d07869955108fd4cf275f' 
  AND token = 'jJjyXXi4IQ7Da1M/bAV4n6dqr4PGkeuPRUyEfq4PXLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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