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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ce48e2902b3182b33c593a0174169384ef7a90d793e41b469cd7c5617f3c6c' 
  AND token = 'afWYNYtk4b28/ErBaycTaD8gMDwnQyyIqO7Luuoab70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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