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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a16924fae4942075bfdf200e1a2672e8368a38df418ac0a0181698e0b4363ba' 
  AND token = 'UCr6oEe7bh0LfuO/qKgFp9lNqL9IU2rIvepkkXv4Tos=' 
  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"
    }
  }
}