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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e974998892b774a5c9711b41c5f8e5a5f96aca85a1e1a5897127de7f74a3d789' 
  AND token = 'jtAqRTIOvwG39jcZW59i2ozYjazCT6OnG+LS69NXRsw=' 
  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"
    }
  }
}