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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba914e7dbea5d93a538a9b7d5a5ebd736770fda7af7ba42a973f1643b63acb5' 
  AND token = 'G9A734S++GktBw68MITIAWler6gCFNLSlumLLFfiacM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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