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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa3bc73551cc76dfac8b701c7c851fd1f77ae9d969aec4b765f3f9c32f5f013' 
  AND token = 'EE3AnjtWkRNDb8pXZ9JgNzi/sYBqFJdip/8ov146TQU=' 
  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"
    }
  }
}