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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59ee17dd4f3f8aeead7505974d46a02de8c615353e1daec101a5ae2680b6a19b' 
  AND token = 'kftb0S+1KfjFBEUp+VWQAPmVPFrvNr9rQ/Ft62ELZxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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