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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff21d7320dceac9fc357ba07590b2efbf9e68a0f4ff1f2774b211d5f461683ef' 
  AND token = 'FZQTBcUk8Mwo7pB+ju3IPn1dC6cD4aAA4p7TbKrSKy4=' 
  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"
    }
  }
}