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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87cca2f7ea73aa126d65caab1625eea31fc10717f5bf3dea906d7f6e72b071d0' 
  AND token = 'H2zOIkY0Lh5pfg+8LOKNyr2b4tq2LQ2Y7HykTe0FwfU=' 
  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"
    }
  }
}