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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50ec132e4905adaf762e1f16f9f33b45e29ff495beccce80d2951cd5ad3188ab' 
  AND token = 'L6t2/8JUniyoSSwYB5tyP9xIIyCjWVWZwiBodqy2JX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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