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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef68851f69b8a80f5aa46f520fa36696a04f200b364ad35ea5ef7b60074e776a' 
  AND token = 'YYeNRgBa+NZYnHzYqXoUkaT8nOKP5RfSdfn1ZOszc0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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