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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e898639f94d9c4f47541e2c6e8174176b869fa1c1d1d94a5aee1ec64e1f0e87' 
  AND token = 'QlveKi6s+MLJC16Z31kHV20DR2SoqZB3H4A6QC5wkHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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