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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '950acc7911f5858be42c9c373d7cc57618015fe0851c22bebc6642f8fbaf6673' 
  AND token = 'bsC531BtAewP8L+DZG7L0sEgVIncBO8byDVH7ouidfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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