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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b7791677506173e9014c6a4856e0bad7f4e365f7872ae0d508c4dc9961c1c5a' 
  AND token = 'v5Nvwb9l78zOFNKt6pbauJnHL9T1KzJzYVsCGrfObS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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