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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f3d5f0d01ee479a87ec76605ab09419ac66ae20b6623b1858a00e1f6feed040' 
  AND token = 'U9NEP0wBUWlmLL6MacBG7PIx9DV/usws+CZW8zO8fYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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