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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a23bf739b087fb4c0ec4f9d65151b0ca3c9b281504bca8ca736350e013065c66' 
  AND token = '8jv1LvcDNoToRWSCLWfyR/YuIZ18VcRQvZVKGQ/nDF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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