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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c39a993e2e064e9c963d17cf1a01f0b4fc15d70fff168c4d42279c67009b416' 
  AND token = '0/+5p+e1boNxTtrcd/Qm4cuj1yZd+35+K0nfqHrIvVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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