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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c6b09508d96c43feb8694a2bb07a6d4824c89984b840830b3e4613486045f88' 
  AND token = 'QqnTFha4c4AeWeVJkUvmKlfpC/adngiRxdBLzc6jMFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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