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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44e49a95e5c0d52318c7e547801adc639c0875422702a88c64e60c90f31a5881' 
  AND token = '8Pn2EFjz31ZX4LMKKUyGRlAQZ7x90s2BH9OEHnGXong=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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