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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ead31c8052a609392f20c2b0611108afab47a3ad3877ad0cd96be8bf4c15152' 
  AND token = '7Z63I2Ju9U/WrqEL+wAgbmyS+KocRnTy5oVqemDRbWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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