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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da617d199262033e14f8a0f733ef660e4eee792d72dd41a5bd269571ad385c12' 
  AND token = '3qZNRR2lSDYalX1NPdVIXmAvysmEikEWtJ/m/VnHKE4=' 
  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"
    }
  }
}