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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caf20826b19ed7b93eff22d98478d0a7e8cd9b48c1aad7f6bf1906f123e0a2ab' 
  AND token = '94P77fwZdLpUpZeELNrau3xAAGvAdkKLzIG+Hd06Lok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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