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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7947ed401d4ed4e570098878ced96502509262d9e55643e2ef93ccbbf9d2df17' 
  AND token = 'AC9K2noVhoCgtmHcWQ/hMgV+kPRDMg+aIY/ffVWA1EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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