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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7deb9ed28cbc04effe0c968fda3877adc6f4516a7206fb4eb0f870052f1e2d49' 
  AND token = 'uKPG2tlDrgpRRQ1o/uvbXhQLoEfXm8SJuo1eKhPd6ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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