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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc7653d9d3a0dd54c5d9a55944c78238865b5de909a8f5216b397c69cd6371f2' 
  AND token = '75B3haXVJbKCyyeomRO/RX9n3tnvXdVAE0zEYBe/Eww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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