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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0e01dd5769754d952f9f898eb1c36af05e8c0e8fa70bfddc4287a6c7ac51d22' 
  AND token = 'Rdk9QxVS6YCpTu+1HRTl5OVLNn+YhSSvmCvkZFimXJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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