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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a29e5d6ae39771cb0d14d0f08ba2139866813017d83ced1a44d4a19b90c6f0b9' 
  AND token = 'H3PRVX2QnkO+hj+jcDxKPb4urPhIXAzxBEdlYPI4iSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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