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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4facfae4be95cbe076baa04285f0b7907a5860d3b1bde5883b382f56a704b2e4' 
  AND token = 'wC/OGjIWh3C+C9t43AQyoXbx2sPF93glGsZ7uC8xjBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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