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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a959928fb62854f20a0ec9f3a9ca238d260626838aa11d302674620119f5ec8a' 
  AND token = 'XzeAWM0f9VRtZo28uqe/Pu97slWHQyP+bAESyYt+MaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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